Finding the Third Proportional to 309,700.50 and 478,632

Step by Step Solution

1. Step 1: Write the proportion equation
   309,700.50 : 478,632 = 478,632 : x
2. Step 2: Convert to fraction form
   309,700.50/478,632 = 478,632/x
3. Step 3: Cross multiply
   309,700.50x = 478,632 × 478,632
4. Step 4: Simplify right side
   309,700.50x = 229,088,591,424
5. Step 5: Solve for x
   x = 229,088,591,424/309,700.50
6. Step 6: Final answer
   x = 739,710.11